@Mr_NutterButter @LukeAlmighty
Sounds like a you (as in your country in particular) problem. I've learned Chemistry and Physics since age 11 till 16. Biology since age 10. And I stopped at 16 because I was specializing in economics. In most high-schools, you learn these until graduation. Astronomy was folded into Geography for me, which itself probably started at 9 or 10 years, along with History (for these 2 I can't remember for sure when we started).

I can't compare the grammar part apples to apples, cause I speak a different native language. I've had grammar lessons from the start of school till before high school. I could be wrong, but I do not remember any more grammar being done for my native language in high school.
But with English grammar (as a secondary language) I did have things being repeated and redone periodically, even at an university level. I'd wager that fields of study that touch on literature, journalism, might refresh some of the harder grammar for my native language at university too, but I wouldn't know for sure.

You're not distrustful of the experts. You're upset at politicians that toyed around with the school curriculum. Those aren't experts. They're just pretending that their jobs are important by constantly messing around with the curriculum, to make it seem like they're doing something.

It's not that you're wrong for being upset. Far from it. But you're misdirecting your feelings. Experts, of any field (apart from experts in corruption), have little to do with this.